There is currently significant interest in the dynamics of active
matter and the modelling of collective biological motion [1]}. Active
particles take their energy from their surroundings to
induce directed motion.
Natural examples of collective motion in active systems include the flocking of birds,
shoals of fish and clustering in bacterial colonies [2]}.
Within the Physics community, active matter represents a
statistical system driven far from equilibrium which
can can exhibit non-equilibrium ordering and phase
transitions [3]}. However, to date, there is no overarching
framework to describe such phenomena.
